Johan burchardt opsahl



(No Model.)

J. B. OPSAHL. AUTOMATIC GUT-OFF VALVE.

Patented Dec.189'7.

' UNITED STATES PATENT OFTTQE.

J OHAN BUROHARDT OPSAI-IL, OF TORONTO, CANADA.

AUTOMATlC-CUT-OF-F VALVE.

SPECIFICATION formingpart of Letters Patent No. 596,119, dated December 28, 1897.

Application fil d June 4:, 1897. filerial No.639,379.' (No model.)

To aZZ whom it may concern.-

Be it known that I, J OHAN BURCHARDT OP- SAHL, electrical engineer, of the city of Toronto, in the county of York, in the Province of Ontario, Canada, have invented certain new and useful Improvements in Automatic-- Out-Off High-Speed Steam-Engines, of which the following is a specification.-

My invention relates to improvements in automatic-cut-off valves for high-speed steamengines; and the object of the invention is to design an extremely simple,cornpact, economical, and noiseless form of engine which may be driven at a very high rate of speed and cut off at any point of the stroke; and it consists, essentially, in providing each head of the cylinder with radial ports and peculiarly-shaped inlet and exhaustend chambers, with which the ports communicate, and the interior ends of the cylinder with rotary valves provided with radial ports peculiarly arranged as to the exhaust-ports and designed to coact therewith, the edges of the rotary valves being driven through suitable gearing connected to' the main shaft of the engine, cut-off slidevalves also being provided, preferably interposed in recesses between the heads of the cylinderand the rotary valves, the parts being otherwise constructed and arranged in detail as hereinafter more particularly explained.

Figure l is a sectional perspective View of an engine constructed in accordance with my invention. Fig. 2 is a sectional plan on the line 00 12 Fig. 1, showing the peculiarly-shaped inlet and exhaust ports and the cut-off slidevalve in dotted lines. Fig. 3 is a plan view of the upper rotary valve, showing in dotted lines the position of the ports inthe end of the cylinder located above it. Fig. 4 is a detail of the cut-0E slide-valve.

In the drawings, like letters and numerals of reference indicate corresponding parts in each figure.

A is the central portion of the cylinder, which is provided with the end flanges a.

B and O are the upper and lower heads, which are provided with the flanges b and c, which are respectively secured to the upper and lower flanges a a.

Dis the steam-chest, formed at one side and to the top and bottom of the cylinder.

The outer flanges a of the cylinder extend around to the outside of the steam-chest, and the outer flanges b and c extend around the outside 'of the steam-chest adjacent to the flanges a a, to which they are securely bolted. The interior heads 13 and O of the cylinder are flangeless at one side. The steam-chest D is divided into two ports by the angularlyformed wall D, extending above the head B, below the'head C,and down between the heads and sides of the cylinder A, as indicated more particularly in Fig. 2, thus forming an inletchamber D and exhaust-chamber D These chambers are provided with an inlet-port 2 and an exhaust-port V It will be noticed in reference to Figs. 2 and 3 that the radially-formed ports cl in the head and in the exhaust-chamber d are equidistant from each other, as also the radiallyformed ports (1 in the head and in the inletchamber. The inlet set of ports are located so that one end is farther away from the end of the outlet set of ports than the other end. In the drawings I show the top set of inlet ports with the radial edge of the end port next the major side of the wall farther away from the exhaust-port than the other end inlet-port is away from the other end exhaustport. In the lower set of ports this would be' reversed, as will be understood from what the cylinder at a time.

The upper and lower rotary valves E and F are in disk form, with toothed rims e and f and are provided with a corresponding number of radial ports 6' and f, situated equidistant from each other and made much narrower thanthe ports d and d in the heads of the cylinder. The rotary valve E has a central opening 6 whereby it is journaled on the bearing E. The rotary valve F has a central opening f by which the valve is suitably journaled on the sleeve 0.

G is the piston, and G is the piston-rod, which is connected by the usual crank g to the main shaft H, and it is held in position during its reciprocal movement in any suitable manner, such as shown. v The main shaft H is journaled in the bed I, and the cylinder and valve-chest are supported above the bed I by the upright rods J.

K is a spindle extending through the chest and supported in suitable bearings a at the side of the cylinder and cross-bar a extending between the rods J, one of which is not shown.

L is a bevel spunpinion which meshes with a bevel spur-pinion M on the end of the shaft II.

N and N are pinions secured to the spindle K and meshing with the toothed rims c and fot the rotary valves E and F, respectively.

and O are cut-oil slide-valves arc-shaped in form and provided with radial openings and o. The cut-off slide-valve O is situated in a recess B, made in the top head of the cylinder, and the cut-off slide-valve O is situat ed in the recess 0, made in the bottom head of the cylinder. The cutoff slide-valves O and O are provided with slotted arms 0 and 0, through which the spindles K extend, such arms being connected bya suitable link 0 to a rod 0, which is suitably connected by gearing to the governor of the engine or placed within the control of the engineer or provided with any other suitable regulating device. Such cut-off valves of course serve to regulate the supply of steam through the inlet-chambers, according to the load on the engine.

Having now described the principal parts involved in my invention, I shall briefly describe the working of the engine.

The steam admitted through the port 2 passes into the inlet-chamber D and, as shown in the drawings, passes through the radial ports (1 in the lower-head port 0 in the slidevalve and ports f in the rotary valve F, thereby forcing the piston G (shown in dotted lines) upwardly. At the period that the inlet-ports are opening to admit the steam through the lower head the ports 6 in the upper rotary valve are caused to rotate opposite the ports in the upper head of the cylinder, thereby allowing of the exhaust from the cylinder above the piston. At the same time also the exhaust-ports d in the lower head are closed by the rotary valve and the inlet-ports (Z in the upper head are closed. \Vhen the piston reaches the end of its upward stroke, the gearing brings the upper inlet-ports open and the lower exhaust-ports also open, thereby cans in g the steam to force the piston downwardly and the exhaust-steam to escape through the exhaust-port 3. The opening and closing of the valves above described is of course contin uously repeated, thus giving the reciprocal motion to the piston-rod and rotary movement to the shaft.

In the event of it being desired to make the engine with both an automatic cut-oil and a reverse-engine the cut-off slide-valve would then be made in the form of a complete ring, so that the steam-ports may also be allowed to be shifted on the exhaust side. In this case the inlet-valve is constructed in the same way as before. The cylinder-heads are also the same. The cut-off valve is not only a complete ring, but is constructed so as to cover every other one of the steam-ports on the inlet side as well as the exhaust side at the same time that the others are open. I, however, do not describe particularly the operation of a reverse-engine, as any mechanic skilled in the art would readily understand how to construct it.

It will be understood, however, that the op eration of the engine would not be changed if the valves were to be on the outside of the cylinder-heads instead of on the inside or if a separate valve for the exhaust and inlet ports were used.

It will be noticed that in the construction of my engine the valve clearance is reduced to a minimum. Consequently a very high efficiency is obtained. The lead and lap would be constant and the engine not likely to get out of order, as no disengaging mechanism is used. There is also very much less friction in the operation of the rotary valves 011 ac count of them having to make such a short turn in providing for the admission and exhaust of the steam.

Another advantage arises from the fact that no eccentric or like parts are used, which consume so much of the power, nor is there any link motion, as in the ordinary slide-valve reverse-engine, and in comparison therewith a much more quick opening and closing of the steam-ports is eitected. The noise is prevented, as all springs and other disengaging mechanisms are eliminated.

What I claim as my invention is- 1. In an automatic-cut-oif high-speed en gine, in combination the cylinder, the piston and piston-rods suitably connected to the shaft, the heads of the cylinder provided with radial steam ports, the inlet and exhaust chambers dividing the steam-ports into two sections at each end, and the rotary valves common to the ports of both of said sections provided with radial ports suitably driven from the main shaft as and for the purpose specified.

2. I11 combination, the cylinder, the piston and piston-rod, each head of the cylinder being provided with a series of radial ports, a chamber around the cylinder, a partition therein dividing said chamber into inlet and exhaust chambers, a single valve at each head of the cylinder, and supplemental valves located solely in the inlet-chamber adapted to regulate the inlet-ports in said heads, substantially as described.

3. In combination, the cylinder, the piston and piston-rod, each head of the cylinder being provided with a series of radial ports, a chamber around the cylinder, a partition therein dividing said chamber into inlet and exhaust chambers, a single valve at each head of the cylinder, and a supplemental valve located between each of the main valves and stantially as described.

4. In an automatic-cutoff high-speed engine, incombination the cylinder, the piston and piston-rods suitably connected to the shaft, the heads of the cylinder provided with radial ports,-the inlet and exhaust chambers dividing the steam-ports into two sections at each end, and the rotary radial valves locatedto the interior of the heads, the equidistant ports in same and means for rotating such valves as and for the purpose specified.

5. In an automatic-cut-off high-speed engine, in combination the cylinder, the piston and piston-rods suitably connected to the shaft, the heads of the cylinder provided with radialsteam-ports, the inlet and exhaust chambers dividing the steam-ports into two sections at each end, the rotary valves located to the interior of the heads, the equidistant rotary ports and means for rotating such valves and the cut-off slide-valves provided with radial ports, slotted arm and link-andradial steam ports, the inlet and exhaust chambers provided with the angular divisionwall dividing the steam-ports into a minor number of inlet-ports and a major number of outlet-ports and the rotary valves located to the interior of the heads and means for rotating such valves as-and for the purpose specified.

7. In an automatic-cutoff high-speed engine, in combination the cylinder, the'piston and piston rods suitably connected to the shaft, the heads of the cylinder provided With radial steam-ports,,arranged in two sets, the ports of each set being equidistant apart and the ends of the sets being unequally separated circuinferentially, the inlet and exhaust chambers provided with the angular division- Wall dividing the steam-ports into a minor number 'of inlet-ports and a major number of outlet-ports and the rotary valves located to the interior of the heads and means for rotating such valves as and for the purpose specifled.

JoHAN BURCHARDT OPSAHL.

Witnesses:

B. BOYD, H. T. S. YOUNG. 

